untreated

adjective

un·​treat·​ed ˌən-ˈtrē-təd 

: not treated

untreated wastewater

especially : not improved or controlled medically

an untreated case of pneumonia

untreated diabetic patients

Synonyms of untreated

• crude
• unprocessed
• natural
• raw
• native

Examples of untreated in a Sentence

untreated wool

Recent Examples on the Web

The cumulative effects of chronic stress, exposure to the elements, untreated medical conditions, poor nutrition and limited access to healthcare can lead to the early onset of geriatric conditions such as cognitive impairment, mobility limitations and frailty. —Panashe Matemba-Mutasa, Mercury News, 15 June 2026

According to the company, the pilot operated continuously for thousands of hours using untreated biogas composed of roughly 65 percent methane and 35 percent carbon dioxide. —Aamir Khollam, Interesting Engineering, 15 June 2026

Key Takeaways Drinking water from a copper cup may help reduce certain bacteria in untreated water. —Kathleen Ferraro, Verywell Health, 15 June 2026

If left untreated, the illness can progress to widespread muscle weakness and paralysis, potentially affecting breathing and requiring intensive medical care. —Victoria Forster, Forbes.com, 14 June 2026

Word History

First Known Use

15th century, in the meaning defined above

Rhymes for untreated

• accreted
• competed
• completed
• conceited
• concreted
• defeated
• deleted
• depleted
• entreated
• intreated
• maltreated
• mistreated

Medical Definition

untreated

adjective

un·​treat·​ed -ˈtrēt-əd 

: not subjected to treatment

an untreated disease